U visa: protection for victims of crime who help investigators
Congress created the U visa in 2000 so that victims of serious crimes would come forward without fear of deportation. It is for people who were victims of a qualifying crime that occurred in the United States or violated US law, who suffered substantial physical or mental abuse as a result, and who have been, are being, or are likely to be helpful to the police, prosecutors or a judge. A law enforcement agency must sign a certification (Form I-918B) confirming that help. Ten thousand principal U visas are available each year, far fewer than the applications, so a waiting list and a 'bona fide determination' process exist: an applicant found to have a complete, credible petition can receive a work permit and protection from removal while waiting, often for years. Family members can be included. After three years in U status the holder can apply for a green card.
Education, not legal advice.
Talk to an attorney who does U visa work